Images loosing quallity

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1

I built a selfhosted instace of Nextcloud directly on Ubuntu Server 24.04 LTS.
This instance works as a virtual drive for a Marketing and Comunication Agency.

They asked me about Nextcloud can be reducing the image quality.
I’m not talk about previews, because they make a download of medias, do the editions and doing the upload again to the server.

In some cases, they noticed low-quality images, so after a meeting where no one was held responsible, they asked me if Nextcloud could be the main cause of this.

So, I’m here asking you, Nextcloud masters.
Could Nextcloud be the culprit?

Thanks
Best regards.

2

Hi @Claudio_Rodrigues_da

I’’m pretty sure that Nextcloud doesn’t make any changes to files on its own. However, you can easily verify whether a file has been altered by comparing its hash values:

Linux / macOS:

sha256sum original.file
sha256sum downloaded.file

Windows (PowerShell):

Get-FileHash original.file -Algorithm SHA256
Get-FileHash downloaded.file -Algorithm SHA256

If the hashes match, the files are identical.